[eliben]

It took me a number of readings before I figured it out, back in the day. I summarized my understanding in http://eli.thegreenplace.net/2010/01/02/top-down-operator-pr... -- hope it's helpful

[elFarto]

I found http://journal.stuffwithstuff.com/2011/03/19/pratt-parsers-e... really useful as well.